• First generation – Warfarin, chlorophacinone, and coumatetralyl. It is generally accepted that a wide degree of resistance has built up against these compounds• Second generation – Includes brodifacoum, bromadiolone, difenacoum, difethialone and flocoumafen. Difethialone is not currently approved for use in the UK. The second generation anticoagulant baits are very effective, even against warfarin-resistant rodents. They are very potent and a single feed can be sufficient to provide a lethal dose but they still have the chronic anticoagulant action 12.3.1 Rodenticide formulationsFormulations are the ways in which the rodenticide is presented to the target animal. Knowledge of the advantages and disadvantages of different formulations is important when selecting a rodenticide for a particular species and habitat.Baits are the most common way to present a rodenticide. They can either be edible or liquid. Both edible and drinkable baits generally contain coloured dyes. This is principally a safety measure used to indicate product contamination or when a non-target organism has eaten bait. Anticoagulant rodenticides are usually coloured red, blue,purple, grey or green.Rats and mice have very wide-rangingtastes, feeding on whatever is available. However,
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